logind-inhibit.c revision f8e2fb7b14e53f5a4bcfd66d26910af1dee185c6
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2012 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <fcntl.h>
#include <sys/epoll.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include "util.h"
#include "mkdir.h"
#include "logind-inhibit.h"
Inhibitor* inhibitor_new(Manager *m, const char* id) {
Inhibitor *i;
assert(m);
i = new0(Inhibitor, 1);
if (!i)
return NULL;
i->state_file = strappend("/run/systemd/inhibit/", id);
if (!i->state_file) {
free(i);
return NULL;
}
i->id = file_name_from_path(i->state_file);
if (hashmap_put(m->inhibitors, i->id, i) < 0) {
free(i->state_file);
free(i);
return NULL;
}
i->manager = m;
i->fifo_fd = -1;
return i;
}
void inhibitor_free(Inhibitor *i) {
assert(i);
free(i->who);
free(i->why);
hashmap_remove(i->manager->inhibitors, i->id);
inhibitor_remove_fifo(i);
if (i->state_file) {
unlink(i->state_file);
free(i->state_file);
}
free(i);
}
int inhibitor_save(Inhibitor *i) {
char *temp_path, *cc;
int r;
FILE *f;
assert(i);
r = safe_mkdir("/run/systemd/inhibit", 0755, 0, 0);
if (r < 0)
goto finish;
r = fopen_temporary(i->state_file, &f, &temp_path);
if (r < 0)
goto finish;
fchmod(fileno(f), 0644);
fprintf(f,
"# This is private data. Do not parse.\n"
"WHAT=%s\n"
"UID=%lu\n"
"PID=%lu\n",
inhibit_what_to_string(i->what),
(unsigned long) i->uid,
(unsigned long) i->pid);
if (i->who) {
cc = cescape(i->who);
if (!cc)
r = -ENOMEM;
else {
fprintf(f, "WHO=%s\n", cc);
free(cc);
}
}
if (i->why) {
cc = cescape(i->why);
if (!cc)
r = -ENOMEM;
else {
fprintf(f, "WHY=%s\n", cc);
free(cc);
}
}
if (i->fifo_path)
fprintf(f, "FIFO=%s\n", i->fifo_path);
fflush(f);
if (ferror(f) || rename(temp_path, i->state_file) < 0) {
r = -errno;
unlink(i->state_file);
unlink(temp_path);
}
fclose(f);
free(temp_path);
finish:
if (r < 0)
log_error("Failed to save inhibit data for %s: %s", i->id, strerror(-r));
return r;
}
int inhibitor_start(Inhibitor *i) {
assert(i);
if (i->started)
return 0;
log_debug("Inhibitor %s (%s) pid=%lu uid=%lu started.",
strna(i->who), strna(i->why),
(unsigned long) i->pid, (unsigned long) i->uid);
inhibitor_save(i);
i->started = true;
manager_send_changed(i->manager, "Inhibited\0");
return 0;
}
int inhibitor_stop(Inhibitor *i) {
assert(i);
if (i->started)
log_debug("Inhibitor %s (%s) pid=%lu uid=%lu stopped.",
strna(i->who), strna(i->why),
(unsigned long) i->pid, (unsigned long) i->uid);
if (i->state_file)
unlink(i->state_file);
i->started = false;
manager_send_changed(i->manager, "Inhibited\0");
return 0;
}
int inhibitor_load(Inhibitor *i) {
InhibitWhat w;
int r;
char *cc,
*what = NULL,
*uid = NULL,
*pid = NULL,
*who = NULL,
*why = NULL;
r = parse_env_file(i->state_file, NEWLINE,
"WHAT", &what,
"UID", &uid,
"PID", &pid,
"WHO", &who,
"WHY", &why,
"FIFO", &i->fifo_path,
NULL);
if (r < 0)
goto finish;
w = inhibit_what_from_string(what);
if (w >= 0)
i->what = w;
parse_uid(uid, &i->uid);
parse_pid(pid, &i->pid);
if (who) {
cc = cunescape(who);
if (!cc) {
r = -ENOMEM;
goto finish;
}
free(i->who);
i->who = cc;
}
if (why) {
cc = cunescape(why);
if (!cc) {
r = -ENOMEM;
goto finish;
}
free(i->why);
i->why = cc;
}
if (i->fifo_path) {
int fd;
fd = inhibitor_create_fifo(i);
if (fd >= 0)
close_nointr_nofail(fd);
}
finish:
free(what);
free(uid);
free(pid);
free(who);
free(why);
return r;
}
int inhibitor_create_fifo(Inhibitor *i) {
int r;
assert(i);
/* Create FIFO */
if (!i->fifo_path) {
r = safe_mkdir("/run/systemd/inhibit", 0755, 0, 0);
if (r < 0)
return r;
if (asprintf(&i->fifo_path, "/run/systemd/inhibit/%s.ref", i->id) < 0)
return -ENOMEM;
if (mkfifo(i->fifo_path, 0600) < 0 && errno != EEXIST)
return -errno;
}
/* Open reading side */
if (i->fifo_fd < 0) {
struct epoll_event ev;
i->fifo_fd = open(i->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY);
if (i->fifo_fd < 0)
return -errno;
r = hashmap_put(i->manager->inhibitor_fds, INT_TO_PTR(i->fifo_fd + 1), i);
if (r < 0)
return r;
zero(ev);
ev.events = 0;
ev.data.u32 = FD_FIFO_BASE + i->fifo_fd;
if (epoll_ctl(i->manager->epoll_fd, EPOLL_CTL_ADD, i->fifo_fd, &ev) < 0)
return -errno;
}
/* Open writing side */
r = open(i->fifo_path, O_WRONLY|O_CLOEXEC|O_NDELAY);
if (r < 0)
return -errno;
return r;
}
void inhibitor_remove_fifo(Inhibitor *i) {
assert(i);
if (i->fifo_fd >= 0) {
assert_se(hashmap_remove(i->manager->inhibitor_fds, INT_TO_PTR(i->fifo_fd + 1)) == i);
assert_se(epoll_ctl(i->manager->epoll_fd, EPOLL_CTL_DEL, i->fifo_fd, NULL) == 0);
close_nointr_nofail(i->fifo_fd);
i->fifo_fd = -1;
}
if (i->fifo_path) {
unlink(i->fifo_path);
free(i->fifo_path);
i->fifo_path = NULL;
}
}
InhibitWhat manager_inhibit_what(Manager *m) {
Inhibitor *i;
Iterator j;
InhibitWhat what = 0;
assert(m);
HASHMAP_FOREACH(i, m->inhibitor_fds, j)
what |= i->what;
return what;
}
const char *inhibit_what_to_string(InhibitWhat w) {
static const char* const table[_INHIBIT_WHAT_MAX] = {
[0] = "",
[INHIBIT_SHUTDOWN] = "shutdown",
[INHIBIT_SUSPEND] = "suspend",
[INHIBIT_IDLE] = "idle",
[INHIBIT_SHUTDOWN|INHIBIT_SUSPEND] = "shutdown:suspend",
[INHIBIT_SHUTDOWN|INHIBIT_IDLE] = "shutdown:idle",
[INHIBIT_SHUTDOWN|INHIBIT_SUSPEND|INHIBIT_IDLE] = "shutdown:suspend:idle",
[INHIBIT_SUSPEND|INHIBIT_IDLE] = "suspend:idle"
};
if (w < 0 || w >= _INHIBIT_WHAT_MAX)
return NULL;
return table[w];
}
InhibitWhat inhibit_what_from_string(const char *s) {
InhibitWhat what = 0;
char *w, *state;
size_t l;
FOREACH_WORD_SEPARATOR(w, l, s, ":", state) {
if (l == 8 && strncmp(w, "shutdown", l) == 0)
what |= INHIBIT_SHUTDOWN;
else if (l == 7 && strncmp(w, "suspend", l) == 0)
what |= INHIBIT_SUSPEND;
else if (l == 4 && strncmp(w, "idle", l) == 0)
what |= INHIBIT_IDLE;
else
return _INHIBIT_WHAT_INVALID;
}
return what;
}